What is "old song"

Song \Song\ (s[o^]ng; 115), n. [AS. song, sang, fr. singan to sing; akin to D. zang, G. sang, Icel. s["o]ngr, Goth. saggws. See Sing.]

1. That which is sung or uttered with musical modulations of the voice, whether of a human being or of a bird, insect, etc. ``That most ethereal of all sounds, the song of crickets.''
   --Hawthorne.

2. A lyrical poem adapted to vocal music; a ballad.

3. More generally, any poetical strain; a poem.

   The bard that first adorned our native tongue Tuned to his British lyre this ancient song.
   --Dryden.

4. Poetical composition; poetry; verse.

   This subject for heroic song.
   --Milton.

5. An object of derision; a laughingstock.

   And now am I their song, yea, I am their byword.
   --Job xxx. 9.

6. A trifle; an insignificant sum of money; as, he bought it for a song. ``The soldier's pay is a song.''
   --Silliman.

   Old song, a trifle; nothing of value. ``I do not intend to be thus put off with an old song.''
   --Dr. H. More.

   Song bird (Zo["o]l.), any singing bird; one of the Oscines.

   Song sparrow (Zo["o]l.), a very common North American sparrow ( Melospiza fasciata, or Melospiza melodia) noted for the sweetness of its song in early spring. Its breast is covered with dusky brown streaks which form a blotch in the center.

   Song thrush (Zo["o]l.), a common European thrush ( Turdus musicus), noted for its melodius song; -- called also mavis, throstle, and thrasher.

   Syn: Sonnet; ballad; canticle; carol; canzonet; ditty; hymn; descant; lay; strain; poesy; verse.

n. A trifle; nothing of value.